I've driven to Maiden a dozen times... you can too - it's on most maps and accessible. It's really just an area now.
The area has not been touched much since that era... it's tempting too!
A guy I worked with 10 years ago was arrested for detecting very near there. Let me know if it works out for you!
There are also active working gold mines in the... they are very protective, you'll like the signs about death with skulls and such. LOL
It's a beautiful area in summer... it snows there about October through May, so plan accordingly. It's north of Lewistown.
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The other article locates the Bear Paw Battlefield - It's the Nez Perce National Historical Monument.
Detect there - go straight to jail, do not pass go, do not collect 200 old buttons.